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                                <h1 id="listview">ListView</h1>
<p>&#x6EDA;&#x52A8;&#x5217;&#x8868;&#xFF0C;&#x53EF;&#x4EE5;&#x5F88;&#x5355;&#x7EAF;&#x4E2D;&#x586B;&#x5145;&#x56FA;&#x5B9A;&#x4E2A;&#x6570;&#x7684;&#x5185;&#x5BB9;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x5FAA;&#x73AF;&#x6E32;&#x67D3;&#x5217;&#x8868;&#x6570;&#x636E;&#x3002;</p>
<h2 id="&#x586B;&#x5145;&#x56FA;&#x5B9A;&#x5185;&#x5BB9;">&#x586B;&#x5145;&#x56FA;&#x5B9A;&#x5185;&#x5BB9;</h2>
<p>&#x7528;&#x6CD5;&#x6700;&#x7B80;&#x5355;&#xFF0C;&#x5C06;&#x9700;&#x8981;&#x7684;&#x5185;&#x5BB9;&#x8282;&#x70B9;&#xFF0C;&#x76F4;&#x63A5;&#x5199;&#x5165;&#x5230; <code>ListView</code> &#x7EC4;&#x4EF6;&#x7684; <code>children</code> &#x5C5E;&#x6027;&#x4E2D;&#x5373;&#x53EF;&#xFF0C;&#x4EE3;&#x7801;&#x793A;&#x4F8B;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-dart">ListView(
  children: &lt;Widget&gt;[
    ListTile(
      title: Text(<span class="hljs-string">&apos;&#x6211;&#x8981;&#x53D1;&#x5E03;&apos;</span>),
      trailing: Icon(Icons.send),
    ),
    Divider(),
    ListTile(
      title: Text(<span class="hljs-string">&apos;&#x6CE8;&#x9500;&apos;</span>),
      trailing: Icon(Icons.exit_to_app),
    )
  ]
)
</code></pre>
<h2 id="&#x5FAA;&#x73AF;&#x6E32;&#x67D3;&#x5217;&#x8868;&#x6570;&#x636E;">&#x5FAA;&#x73AF;&#x6E32;&#x67D3;&#x5217;&#x8868;&#x6570;&#x636E;</h2>
<p>&#x5982;&#x679C;&#x8981;&#x628A;&#x5217;&#x8868;&#x6570;&#x636E;&#xFF0C;&#x901A;&#x8FC7;&#x5FAA;&#x73AF;&#x6E32;&#x67D3;&#x4E4B;&#x540E;&#xFF0C;&#x5F97;&#x5230; UI &#x7ED3;&#x6784;&#x7C7B;&#x4F3C;&#x7684;&#x5217;&#x8868;&#x9875;&#x9762;&#xFF0C;&#x63A8;&#x8350;&#x4F7F;&#x7528; <code>ListView.builder()</code>&#xFF0C;&#x57FA;&#x7840;&#x7528;&#x6CD5;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-dart">ListView.builder(
  <span class="hljs-comment">// &#x5FC5;&#x987B;&#x6307;&#x5B9A;&#x5217;&#x8868;&#x9879;&#x7684;&#x957F;&#x5EA6;</span>
  itemCount: &#x5217;&#x8868;&#x9879;&#x7684;&#x957F;&#x5EA6;,
  <span class="hljs-comment">// Item &#x9879;&#x7684;&#x6784;&#x5EFA;&#x5668;</span>
  itemBuilder: (BuildContext ctx, <span class="hljs-built_in">int</span> i) {
    <span class="hljs-keyword">return</span> Text(<span class="hljs-string">&apos;aaa&apos;</span>);
  }
)
</code></pre>
<h3 id="&#x4FDD;&#x6301;&#x5217;&#x8868;&#x9879;&#x7684;&#x6570;&#x636E;&#x72B6;&#x6001;">&#x4FDD;&#x6301;&#x5217;&#x8868;&#x9879;&#x7684;&#x6570;&#x636E;&#x72B6;&#x6001;</h3>
<p>&#x5982;&#x679C;&#x5B58;&#x5728;&#x591A;&#x4E2A;&#x5217;&#x8868;&#x9875;&#x4E4B;&#x95F4;&#x7684;&#x52A8;&#x6001;&#x5207;&#x6362;&#xFF0C;&#x9ED8;&#x8BA4;&#x65E0;&#x6CD5;&#x4FDD;&#x6301;&#x6BCF;&#x4E2A;&#x5217;&#x8868;&#x9879;&#x7684;&#x6EDA;&#x52A8;&#x8DDD;&#x79BB;&#x3001;&#x6570;&#x636E;&#x72B6;&#x6001;&#x7B49;&#x4FE1;&#x606F;&#xFF0C;&#x6B64;&#x65F6;&#x9700;&#x8981;&#x5B9E;&#x73B0; <code>AutomaticKeepAliveClientMixin</code> &#x7279;&#x5F81;&#xFF0C;&#x6765;&#x4FDD;&#x6301;&#x5217;&#x8868;&#x9879;&#x7684;&#x6EDA;&#x52A8;&#x72B6;&#x6001;&#xFF0C;&#x793A;&#x4F8B;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-dart"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">_MovieListState</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">State</span>&lt;<span class="hljs-title">MovieList</span>&gt;
    <span class="hljs-title">with</span> <span class="hljs-title">AutomaticKeepAliveClientMixin</span> </span>{
      <span class="hljs-comment">// &#x91CD;&#x5199; wantKeepAlive &#x51FD;&#x6570;</span>
      <span class="hljs-meta">@override</span>
      <span class="hljs-built_in">bool</span> <span class="hljs-keyword">get</span> wantKeepAlive =&gt; <span class="hljs-keyword">true</span>;
    }
</code></pre>
<h3 id="&#x76D1;&#x542C;&#x5217;&#x8868;&#x662F;&#x5426;&#x6EDA;&#x52A8;&#x5230;&#x9875;&#x9762;&#x5E95;&#x90E8;">&#x76D1;&#x542C;&#x5217;&#x8868;&#x662F;&#x5426;&#x6EDA;&#x52A8;&#x5230;&#x9875;&#x9762;&#x5E95;&#x90E8;</h3>
<p>&#x6709;&#x65F6;&#x5019;&#xFF0C;&#x9700;&#x8981;&#x5B9E;&#x73B0;&#x5217;&#x8868;&#x6EDA;&#x52A8;&#x5230;&#x9875;&#x9762;&#x5E95;&#x90E8;&#x4E4B;&#x540E;&#xFF0C;&#x81EA;&#x52A8;&#x52A0;&#x8F7D;&#x4E0B;&#x4E00;&#x9875;&#x6570;&#x636E;&#xFF0C;&#x6B64;&#x65F6;&#x9700;&#x8981;&#x501F;&#x52A9;&#x4E8E; <code>ScrollController</code> &#x5B9E;&#x73B0;&#x6EDA;&#x52A8;&#x76D1;&#x542C;&#xFF0C;&#x793A;&#x4F8B;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-dart"><span class="hljs-comment">// &#x5B9A;&#x4E49;&#x79C1;&#x6709;&#x53D8;&#x91CF; _scrollCtrl</span>
ScrollController _scrollCtrl;

<span class="hljs-comment">// &#x91CD;&#x5199; initState &#x751F;&#x547D;&#x5468;&#x671F;&#x51FD;&#x6570;</span>
<span class="hljs-meta">@override</span>
<span class="hljs-keyword">void</span> initState() {
  <span class="hljs-comment">// &#x6B64;&#x884C;&#x4E3A;&#x9ED8;&#x8BA4;&#x4EE3;&#x7801;&#xFF0C;&#x4E0D;&#x80FD;&#x5220;&#x9664;</span>
  <span class="hljs-keyword">super</span>.initState();
  <span class="hljs-comment">// &#x521D;&#x59CB;&#x5316;&#x4E00;&#x4E2A; ScrollController &#x6EDA;&#x52A8;&#x63A7;&#x5236;&#x5668;</span>
  _scrollCtrl = <span class="hljs-keyword">new</span> ScrollController();
  <span class="hljs-comment">// &#x4E3A; _scrollCtrl &#x6EDA;&#x52A8;&#x63A7;&#x5236;&#x5668;&#x6DFB;&#x52A0;&#x76D1;&#x542C;&#x4E8B;&#x4EF6;</span>
  _scrollCtrl.addListener(() {
    <span class="hljs-comment">// _scrollCtrl.position.pixels &#x5F53;&#x524D;&#x5217;&#x8868;&#x6EDA;&#x52A8;&#x7684;&#x8DDD;&#x79BB;</span>
    <span class="hljs-comment">// _scrollCtrl.position.maxScrollExtent &#x5217;&#x8868;&#x7684;&#x6700;&#x5927;&#x6EDA;&#x52A8;&#x8DDD;&#x79BB;</span>
    <span class="hljs-keyword">if</span> (_scrollCtrl.position.pixels == _scrollCtrl.position.maxScrollExtent) {
      <span class="hljs-comment">// &#x8C03;&#x7528; setState &#x51FD;&#x6570;&#xFF0C;&#x8BA9;&#x9875;&#x7801;&#x503C; +1</span>
      setState(() {
        _page++;
      });
      <span class="hljs-comment">// &#x83B7;&#x53D6;&#x65B0;&#x9875;&#x9762;&#x7684;&#x6570;&#x636E;</span>
      _getMovieList();
    }
  });
}
</code></pre>
<h3 id="&#x4E3A;-listview-&#x7EC4;&#x4EF6;&#x6DFB;&#x52A0;-controller-&#x6EDA;&#x52A8;&#x63A7;&#x5236;&#x5668;">&#x4E3A; ListView &#x7EC4;&#x4EF6;&#x6DFB;&#x52A0; controller &#x6EDA;&#x52A8;&#x63A7;&#x5236;&#x5668;</h3>
<p>&#x5982;&#x679C;&#x60F3;&#x76D1;&#x542C; <code>ListView</code> &#x7EC4;&#x4EF6;&#x7684;&#x6EDA;&#x52A8;&#x6548;&#x679C;&#xFF0C;&#x53EF;&#x4EE5;&#x4E3A; <code>ListView.builder()</code> &#x63D0;&#x4F9B; <code>controller</code> &#x5C5E;&#x6027;&#xFF0C;&#x503C;&#x4E3A; <code>ScrollController</code> &#x7684;&#x793A;&#x4F8B;&#x5BF9;&#x8C61;&#xFF0C;&#x793A;&#x4F8B;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-dart">ListView.builder(
  controller: _scrollCtrl,
  itemCount: _mlist.length,
  itemBuilder: (BuildContext ctx, <span class="hljs-built_in">int</span> i) {}
)
</code></pre>
<h3 id="&#x6E05;&#x7406;&#x6EDA;&#x52A8;&#x63A7;&#x5236;&#x5668;">&#x6E05;&#x7406;&#x6EDA;&#x52A8;&#x63A7;&#x5236;&#x5668;</h3>
<p>&#x5F53;&#x9875;&#x9762;&#x88AB;&#x9500;&#x6BC1;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x6700;&#x597D;&#x4E3B;&#x52A8;&#x9500;&#x6BC1;&#x5BF9;&#x5E94;&#x7684;&#x6EDA;&#x52A8;&#x63A7;&#x5236;&#x5668;&#xFF0C;&#x4E3B;&#x52A8;&#x91CA;&#x653E;&#x5185;&#x5B58;&#xFF0C;&#x63D0;&#x9AD8;&#x6027;&#x80FD;&#xFF1A;</p>
<pre><code class="lang-dart"><span class="hljs-comment">// &#x91CD;&#x65B0; dispose &#x51FD;&#x6570;</span>
<span class="hljs-meta">@override</span>
<span class="hljs-keyword">void</span> dispose() {
  <span class="hljs-keyword">super</span>.dispose();
  <span class="hljs-comment">// &#x4E3B;&#x52A8;&#x9500;&#x6BC1;&#x6EDA;&#x52A8;&#x63A7;&#x5236;&#x5668;</span>
  _scrollCtrl.dispose();
}
</code></pre>
<h3 id="&#x83B7;&#x53D6;&#x4E0B;&#x4E00;&#x9875;&#x6570;&#x636E;&#x540E;&#x5408;&#x5E76;&#x6570;&#x7EC4;">&#x83B7;&#x53D6;&#x4E0B;&#x4E00;&#x9875;&#x6570;&#x636E;&#x540E;&#x5408;&#x5E76;&#x6570;&#x7EC4;</h3>
<p>&#x5982;&#x679C;&#x5206;&#x9875;&#x52A0;&#x8F7D;&#x6570;&#x636E;&#xFF0C;&#x5219;&#x5E94;&#x8BE5;&#x8BA9;&#x65E7;&#x6570;&#x7EC4;&#x4E3B;&#x52A8;&#x62FC;&#x63A5;&#x65B0;&#x6570;&#x7EC4;&#xFF0C;&#x4EE3;&#x7801;&#x793A;&#x4F8B;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-dart">setState(() {
  _total = result.data[<span class="hljs-string">&apos;count&apos;</span>];
  <span class="hljs-comment">// &#x8C03;&#x7528;&#x6570;&#x7EC4;&#x7684; addAll &#x65B9;&#x6CD5;&#xFF0C;&#x53EF;&#x4EE5;&#x4E3B;&#x52A8;&#x5408;&#x5E76;&#x53E6;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;</span>
  _mlist.addAll(result.data[<span class="hljs-string">&apos;subjects&apos;</span>]);
});
</code></pre>

                                
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